Warm-Up Exercise 40

Due 12:15 pm, Fri 30 Nov 2012

Physics 123, Fall 2012

Reading assignment: 39.6

Look at the velocity transformation equation, Eqn 39.18 (8th edition). In the context of me throwing a ball forward while riding on a fast train (and being observed by the class on the ground), ux' = the speed at which I throw the ball, v = the speed of the train, and ux = the speed of the ball as measured by the class. Suppose I throw the ball at 0.5 c. What speed does the class observe the ball to travel at when the train is moving at 0.01 c? 0.50 c? 0.99 c? (Give 4 sig figs.) What do you learn from those answers?